I generally put them in checked baggage and always, always, always take the batteries out of vibrators so that they don't go off in transit! However, if you can't check a bag, just put them in a plastic bag, pack them amongst your clothes, and walk through confidently. Physical bag checks are pretty rare (I fly all the time and have never been checked), and you can certainly reduce your risk of being checked by being totally rule-compliant in other ways.
Have a great trip!